Visualisations for London extensions, loft conversions, basements, and refurbishments where clients, neighbours, and planners need to understand the proposed change before construction. Each view is scoped around the decision it supports: planning submission, design sign-off, neighbour explanation, or contractor coordination. Side returns, rear and wraparound extensions, lofts, dormers, mansards, basements and lightwells, covered across Camden, Islington, Hackney, Wandsworth, Lambeth, Westminster and Kensington & Chelsea.
Request a quoteHouse extension CGI turns drawings, sketches, site photographs, and material references into images that explain the proposed change in context. The useful image is not only a polished view of the finished kitchen or garden room. It shows scale, massing, roofline, brick tone, glazing, rooflights, garden threshold, boundary walls, and the relationship with neighbouring homes.
For London homeowners and architects, house extension CGI is most valuable when a proposal needs to be understood by people who do not read plans every day. That can mean a homeowner comparing two rear extension options, an architect preparing a householder planning submission, or a project team checking whether a dormer, side return, basement lightwell, or wraparound extension feels proportionate before money is committed to construction.
London extension CGI usually has to solve one of four visual problems: how a side return uses a narrow terrace plot, how a rear or wraparound extension meets the garden, how a loft conversion changes the roofline, or how a basement lightwell and stair connect new lower-ground space to the existing home. Each type needs different viewpoints.
| Extension type | Typical London property | Visual risk | Useful views |
|---|---|---|---|
| Side return extension | Victorian or Edwardian terrace | Boundary wall height, glazing rhythm, daylight into the kitchen, and neighbour outlook | Garden view, kitchen view, party-wall context, rooflight study |
| Rear or wraparound extension | Terrace, semi-detached, or townhouse plot | Depth, massing, brick match, garden threshold, and the amount of visible glazing | Rear elevation, oblique garden view, interior dining view, material option |
| Loft conversion CGI | Mansard, dormer, hip-to-gable, or roof terrace proposal | Roofline, dormer cheeks, window proportions, and conservation-area visibility | Street view, roofline view, rear view, interior bedroom view |
| Basement visualisation | Prime residential plot or townhouse refurbishment | Lightwell, stair, privacy, garden level change, and lower-ground daylight | Section-style CGI, garden threshold, lightwell view, interior living view |
Many London house extensions sit inside tight terrace streets, conservation areas, or plots where neighbours are close to the proposed rear wall, roof dormer, terrace, or lightwell. House extension CGI helps explain the design in ordinary visual terms: what the extension hides, what it exposes, how far it projects, how high the roofline reads, and whether the proposal feels subordinate to the existing house.
Some extensions may use permitted development, while others need planning permission. Conservation areas, listed settings, Article 4 directions, roof alterations, and local borough policy can change that route. We keep the CGI factual: the image shows the proposal, the existing context, and the visual relationship. Your architect, planning consultant, local planning authority, and Planning Portal guidance decide the planning route.
Where the site needs stronger planning evidence, we bridge the extension package into one of three specialist services. The house extension page stays focused on domestic extension intent; the sibling pages explain the specialist methods. For larger, multi-unit schemes or custom housing estates, we transition from individual domestic briefs to our comprehensive residential developments cgi and property marketing packages.
House extension CGI gives the design team a place to test decisions that are hard to judge from drawings alone. Brick tone can make a rear extension feel calm or heavy. Zinc dormer cheeks can read sharp or intrusive depending on the roofline. Large glazing can brighten the kitchen but also change privacy, reflection, and the way the extension reads from the garden.
For homeowners, the image often settles practical questions: whether the kitchen-dining flow works, where rooflights should sit, how a step to the garden feels, and whether interior finishes carry through to the exterior threshold. For architects, the same CGI can make design intent clear enough for a client, neighbour, or contractor to respond to the actual proposal rather than a guess from plan and elevation drawings.
London stock brick, lime mortar pointing, slate or zinc dormer cheeks, Crittall steel-framed glazing, timber sash windows, standing-seam metal, parapet height, rooflight size, and roofline visibility.
Glazing proportion, daylight reach, privacy, reflection, internal brightness, and the balance between solid wall and glass.
Kitchen-dining flow, garden threshold, terrace level, boundary walls, planting, and the relationship between inside and outside space.
House extension CGI works best when the brief starts with the decision the image needs to support. That can be planning submission, client sign-off, material comparison, neighbour explanation, contractor coordination, or early feasibility. We model in Revit, SketchUp, or Rhino, render in V-Ray or Corona with HDRI lighting, and use photo-matched cameras for an existing-and-proposed comparison. For a broader view of how we manage CGI commissions, visit our architectural visualisation process.
A quote depends on the number of views, the stage of design information, and the level of context needed. A simple material option for a rear extension is different from a camera-matched planning photomontage for a conservation-area roof alteration. Send what you have; we will tell you what is enough and what still needs clarifying.
House extension CGI can help a planning officer, neighbour, or design team understand scale, massing, materials, glazing, and context. It does not guarantee permission. The planning route depends on the proposal, borough policy, permitted development limits, conservation constraints, and professional planning advice.
Yes. CGI can show a permitted development route as a visual proposal, especially where a homeowner wants to understand the design before building. Permitted development limits and conditions are route-dependent, so the visual should sit beside advice from your architect, planning consultant, local authority, or Planning Portal guidance.
Most domestic extension packages use two to four views: one main garden or street context view, one closer material view, and one or two interior or threshold views. Conservation-area, neighbour-sensitive, or roofline-sensitive sites may need more specific viewpoints.
Full drawings help, but early CGI can start from measured plans, elevations, sketches, site photographs, and a clear design brief. The less fixed the design information is, the more the CGI acts as a decision tool rather than a final submission image.
Yes. A clear rear or side view can show boundary walls, projection depth, privacy, overlooking, garden relationship, and roofline in a way that plans alone often do not. The image should stay factual and avoid hiding sensitive parts of the proposal.
Most domestic extension CGI does not need verified views. Sensitive conservation-area, listed-setting, townscape, or long-view contexts may need a camera-matched method. In those cases we bridge the package into our verified views service rather than treating every house extension image as an AVR.
Send drawings, references, deadlines, and intended use. We will scope the visualisation around the decision it needs to support.
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